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Maximum-variance gradiometer technique for removal of spacecraft-generated disturbances from magnetic field data
Geoscientific Instrumentation, Methods and Data Systems ( IF 1.500 ) Pub Date : 2020-12-11 , DOI: 10.5194/gi-9-451-2020
Ovidiu Dragoş Constantinescu , Hans-Ulrich Auster , Magda Delva , Olaf Hillenmaier , Werner Magnes , Ferdinand Plaschke

In situ measurement of the magnetic field using spaceborne instruments requires a magnetically clean platform and/or a very long boom for accommodating magnetometer sensors at a large distance from the spacecraft body. This significantly drives up the costs and the time required to build a spacecraft. Here we present an alternative sensor configuration and a technique allowing for removal of the spacecraft-generated AC disturbances from the magnetic field measurements, thus lessening the need for a magnetic cleanliness programme and allowing for shorter boom length. The final expression of the corrected data takes the form of a linear combination of the measurements from all sensors, allowing for simple onboard software implementation. The proposed technique is applied to the Service Oriented Spacecraft Magnetometer (SOSMAG) on board the Korean geostationary satellite GeoKompsat-2A (GK2A). In contrast to other missions where multi-sensor measurements were used to clean the data on the ground, the SOSMAG instrument performs the cleaning on board and transmits the corrected data in real time, as needed by space weather applications. The successful elimination of the AC disturbances originating from several sources validates the proposed cleaning technique.

中文翻译:

最大方差梯度仪技术,用于从磁场数据中消除航天器产生的干扰

使用太空仪器对磁场进行原位测量需要一个磁性清洁的平台和/或一个非常长的吊杆,以便在距航天器主体很远的地方容纳磁力计传感器。这大大增加了建造航天器的成本和时间。在这里,我们提出了一种替代的传感器配置和一种技术,该技术和技术可从磁场测量结果中消除航天器产生的AC干扰,从而减少了对磁性清洁程序的需求,并缩短了吊杆长度。校正后的数据的最终表达形式为所有传感器的测量值的线性组合形式,从而简化了车载软件的实现。拟议的技术应用于韩国对地静止卫星GeoKompsat-2A(GK2A)上的服务导向航天器磁强计(SOSMAG)。与使用多传感器测量来清洁地面数据的其他任务相反,SOSMAG仪器可以在船上进行清洁并根据太空天气应用的需要实时传输校正后的数据。成功消除源自多个来源的交流干扰,验证了所提出的清洁技术。
更新日期:2020-12-11
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